List subHeaderList = [
  {
    "id": 1,
    "title": "综合",
    "fileds": "all",
    "sort":
    -1, //排序     升序：price_1     {price:1}        降序：price_-1   {price:-1}
  },
  {"id": 2, "title": "销量", "fileds": 'salecount', "sort": -1},
  {"id": 3, "title": "价格", "fileds": 'price', "sort": -1},
  {"id": 4, "title": "筛选"}
];